<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
        <button @click="increment">累加</button>
        <button @click="incrementN(3)">累加n</button>
        <h1>count:{{count}}</h1>
    </div>

    <script>
    //   Vue.config.productionTip = false;

      const vm = new Vue({
        el:"#app",
        data(){
            return {
                count:0,
            }
        },
        methods:{
            increment(){
            //在插值语法中可以直接访问vm身上的属性和方法,但是在事件回调函数中,必须先通过this访问到vm才能
                this.count++;
            },
            incrementN(n){
                this.count += n;
            }
        }
      })
    </script>
</body>
</html>